One of those things that are so obvious once you see it, but never think about before you do.
Out in the dark? No flashlight? Need to carry things but don't have a headlamp either? You have a flashlight feature on your phone, but your hands are full. But you do have your Hip Pack, as part of your Journey pack system, and your smart phone.
Put your hip pack at your front, turn on the light and set the phone vertically in your hip pack, zip up the zipper on each side to hold the phone in place - Ta Da! Light along your path! Don't trip, Journey.